US4245133A - Roof for covered electric smelting furnaces - Google Patents

Roof for covered electric smelting furnaces Download PDF

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Publication number
US4245133A
US4245133A US06/020,427 US2042779A US4245133A US 4245133 A US4245133 A US 4245133A US 2042779 A US2042779 A US 2042779A US 4245133 A US4245133 A US 4245133A
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US
United States
Prior art keywords
roof
cooling
pipes
cooling medium
cooling pipes
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US06/020,427
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English (en)
Inventor
Harald Krogsrud
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Elkem ASA
Original Assignee
Elkem Spigerverket AS
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Filing date
Publication date
Application filed by Elkem Spigerverket AS filed Critical Elkem Spigerverket AS
Application granted granted Critical
Publication of US4245133A publication Critical patent/US4245133A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D1/00—Casings; Linings; Walls; Roofs
    • F27D1/18—Door frames; Doors, lids, removable covers
    • F27D1/1808—Removable covers
    • F27D1/1816—Removable covers specially adapted for arc furnaces
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B3/00—Hearth-type furnaces, e.g. of reverberatory type; Tank furnaces
    • F27B3/10—Details, accessories, or equipment peculiar to hearth-type furnaces
    • F27B3/12—Working chambers or casings; Supports therefor

Definitions

  • the present invention relates to electric smelting furnaces and, more particularly, to improvements in the roofs for electric smelting furnaces.
  • Electric smelting furnaces have been known and used for a great number of years. Covered electric smelting furnaces have also been known and used for a great number of years. However, known covered smelting furnaces generally have not been made gas tight. Because of environmental awareness and government regulations, the desirability of making gas tight covered smelting furnaces has become more and more pronounced. However, there are also problems associated with such covers for electric smelting furnaces.
  • covers for electric smelting furnaces typically comprise a horizontal or approximately horizontal roof section and a side wall which is vertical or substantially vertical and is generally annular.
  • the overall appearance of the roof is similar to the appearance of a fez or the cover of a cake plate.
  • the cover for an electric smelting furnace it is composed of a plurality of pie-shaped sections which are joined together.
  • the abutting sections of the furnace cover are normally bolted together and are usually provided with some type of insulating material between the joining flanges in order to reduce the escape of gas from the smelting furnaces.
  • This insulating material is typically asbestos, mineral wool, or the like.
  • cooling arrangements of this type have two substantial disadvantages.
  • the cooling medium e.g., water
  • the cooling medium usually travels a relatively long path during which it experiences a considerable rise in temperature. This results in different temperatures throughout the roof of the furnace, which has a number of disadvantages including unequal thermal expansion, possible condensation of sulfur, and the like.
  • a second disadvantage to such known systems is that even a pin hole in the plate in the area of the cooling bore can result in the introduction of water to the smelting process, with a resulting and very undesirable reaction with the gases of the smelting furnace operation.
  • the applicant has now discovered an arrangement for cooling smelting furnace roofs which eliminates the foregoing disadvantages. More particularly, a plurality of cooling pipes are affixed to the outside of the furnace cover with a continuous weld. The pipes are of a capacity and spacing sufficient to maintain the temperature on the inside of the cover of the furnace in the range of about 150° C.-400° C. The applicant has also discovered a sealing arrangement which can be used between adjacent plates to help achieve the desired cooling by being completely gas tight.
  • FIG. 1 shows one of the pie-shaped plates making up a cover as used in the present invention
  • FIG. 2 shows in considerably larger scale a cross-sectional view of a pair of pie-shaped plates at the abuttment thereof.
  • FIG. 1 is a general showing of a pie-shaped segment of a cover for an electric smelting furnace, it comprises an arcuate section 10 and a horizontal section 12.
  • FIG. 1 shows only the general construction of the cover plate and does not show the detailed construction of the present invention.
  • FIG. 2 there is shown the connection of two of the plates of FIG. 1.
  • the two top plates 12 and 12a having flanges 14 and 14a are joined together by the cooperating nut and bolt arrangement 16, 18 respectively.
  • the plates 12, 12a are welded tubes 20 for carrying a cooling medium.
  • tubes 22 for carrying a cooling medium. The purpose of these tubes 22 will be discussed hereinafter.
  • Each of the tubes 20 is joined to plate 12 or 12a by a continuous weld 24, and a continuous weld 24 is also preferably used in connection with tubes 22.
  • a spacer member 26 Between the flanges 14, 14a is positioned a spacer member 26. Between the two flanges 14, 14a there is also positioned a hydraulic tube 28, the hydraulic tube having a pressure established therein. Because the Hydraulic tube is gas impermeable and is also capable of adapting to irregularities on the surface of the flanges 14, 14a, it insures a substantially complete gas tight seal. Insulating material 30 such as mineral wool or the like is positioned between the spacer 26 and the hydraulic tube 28 in order to help protect the hydraulic tube from the heat of the smelting furnace. Cooling tubes 22 also help to cool the flanges 14, 14a so that they do not become so hot as to melt the hydraulic tube 28. The hydraulic tube suitably has an internal pressure on the order of 0.5-5 atmospheres.
  • the cooling tubes 20 are of sufficient capacity and appropriately spaced so that when the cooling medium is passed through the bores thereof, the temperature on the surfaces 32 and 32a of the plates 12 and 12a stays within a temperature range of about 150° C.-400° C.
  • the exact dimensions for the cooling tubes and the spacing between adjacent tubes will, of course, vary depending upon the size and design of the smelting furnace and the nature of the particular smelting process employed.
  • the tubes 20 can suitably have a wall thickness of about 4-6 mm and an interior diameter of about 10-15 mm.
  • the spacing of the pipes with this typical arrangement is suitably about 60-110 mm on center.
  • the cooling pipes 12, 12a it is also preferably desirable to maintain relatively even heat throughout the roof plates 12, 12a, and it is desirable to have a temperature variation of no more than about 25° C. It has been found that this result can be maintained by making the cooling pipes relatively short so that there is no more than about a 25° C. rise in temperature of the cooling medium from its introduction to a cooling pipe until it leaves the cooling pipe. It has been found that with the constructional dimensions as described hereinbefore, a pipe length of about 15-25 meters will result in a temperature rise of only about 10° C.-15° C. where water is the cooling medium.
  • the plurality of cooling pipes can suitably be supplied with a manifold (not shown) in known manner.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Furnace Housings, Linings, Walls, And Ceilings (AREA)
  • Vertical, Hearth, Or Arc Furnaces (AREA)
  • Furnace Details (AREA)
  • Heat Treatment Of Articles (AREA)
  • Resistance Heating (AREA)
  • Discharge Heating (AREA)
  • Particle Formation And Scattering Control In Inkjet Printers (AREA)
US06/020,427 1977-12-06 1979-03-14 Roof for covered electric smelting furnaces Expired - Lifetime US4245133A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NO774162A NO146217C (no) 1977-12-06 1977-12-06 Hvelv for lukkede elektriske smelteovner
NO774162 1977-12-06

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
US05966270 Continuation-In-Part 1978-12-04

Publications (1)

Publication Number Publication Date
US4245133A true US4245133A (en) 1981-01-13

Family

ID=19883893

Family Applications (1)

Application Number Title Priority Date Filing Date
US06/020,427 Expired - Lifetime US4245133A (en) 1977-12-06 1979-03-14 Roof for covered electric smelting furnaces

Country Status (20)

Country Link
US (1) US4245133A (es)
JP (1) JPS5486406A (es)
AT (1) AT357586B (es)
AU (1) AU517220B2 (es)
BR (1) BR7807983A (es)
DE (1) DE2852464A1 (es)
ES (1) ES475682A1 (es)
FI (1) FI63832C (es)
FR (1) FR2411381A1 (es)
IN (1) IN150800B (es)
IT (1) IT1202802B (es)
MX (1) MX149716A (es)
NO (1) NO146217C (es)
PH (1) PH18057A (es)
RO (1) RO76303A (es)
SE (1) SE434429B (es)
SU (1) SU1138054A3 (es)
TR (1) TR19995A (es)
YU (1) YU40352B (es)
ZA (1) ZA786515B (es)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2660745A1 (fr) * 1990-04-05 1991-10-11 Siderurgie Fse Inst Rech Four electrique muni de moyens d'etancheite perfectionnes.

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4021603A (en) * 1975-10-22 1977-05-03 Ishikawajima-Harima Jukogyo Kabushiki Kaisha Roof for arc furnace

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1922312A (en) * 1932-01-23 1933-08-15 Union Carbide Corp Electric furnace
FR1309760A (fr) * 1961-01-11 1962-11-16 Knapsack Ag Couvercle pour fours électriques
US3429973A (en) * 1965-09-02 1969-02-25 Frederick H N Carter Furnace construction
GB1227318A (es) * 1967-06-30 1971-04-07
DE2546142B2 (de) * 1975-10-15 1978-04-06 Gerhard 7601 Willstaett Fuchs Deckel für Elektroöfen
DE2639378C3 (de) * 1976-09-01 1985-03-14 Moskovskij večernyj metallurgičeskij institut, Moskva Wassergekühlter Deckel eines Lichtbogenofens

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4021603A (en) * 1975-10-22 1977-05-03 Ishikawajima-Harima Jukogyo Kabushiki Kaisha Roof for arc furnace

Also Published As

Publication number Publication date
SE7812308L (sv) 1979-06-07
TR19995A (tr) 1980-07-01
IT1202802B (it) 1989-02-09
FI783705A (fi) 1979-06-07
MX149716A (es) 1983-12-14
NO146217B (no) 1982-05-10
BR7807983A (pt) 1979-07-31
IN150800B (es) 1982-12-18
PH18057A (en) 1985-03-18
FR2411381A1 (fr) 1979-07-06
YU274478A (en) 1983-10-31
DE2852464A1 (de) 1979-06-07
RO76303A (ro) 1981-03-30
AT357586B (de) 1980-07-25
YU40352B (en) 1985-12-31
ZA786515B (en) 1980-09-24
ATA865878A (de) 1979-12-15
FI63832B (fi) 1983-04-29
NO146217C (no) 1982-08-18
IT7830343A0 (it) 1978-11-29
FR2411381B1 (es) 1980-10-31
SE434429B (sv) 1984-07-23
AU4219478A (en) 1979-06-14
JPS5486406A (en) 1979-07-10
FI63832C (fi) 1983-08-10
SU1138054A3 (ru) 1985-01-30
NO774162L (no) 1979-06-07
ES475682A1 (es) 1979-04-16
AU517220B2 (en) 1981-07-16

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